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Articles
Anorthosite Belts, Continental Drift, and the Anorthosite Event
1 U. S. Geological Survey, Washington, D.C. 20242
Most anorthosites lie in two principal belts when plotted on a predrift continental reconstruction. Anorthosite ages in the belts cluster around 1300 ± 200 million years and range from 1100 to 1700 million years. This suggests that anorthosites are the product of a unique cataclysmic event or a thermal event that was normal only during the earth's early history.
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Science. ISSN 0036-8075 (print), 1095-9203 (online)